Ta
Transition metal
Tantalum
Z 73A 181mass 180.95
Atomic model
tap a particleEvery nucleon is drawn individually — 73 protons and 108 neutrons packed into the nucleus, with 73 electrons on shells outside.
73+1
Protons
Set the element — change this and it becomes a different atom.
1080
Neutrons
Change only these and you get a different isotope of the same element.
73−1
Electrons
Sit outside the nucleus and decide the chemistry, not the element.
Element data
- Nucleons
- 181 (73 p + 108 n)
- Electron shells
- 2 · 8 · 18 · 32 · 11 · 2
- Valence shell
- 2 electrons
- Atomic mass
- 180.95 u
Stability
Tantalum has no measured radioactive isotope in this lab — its nuclei are stable, so decay must be shown as an illustration.
Open the decay lab